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    <h1>
      <a href="../index.html">all files</a> / <a href="index.html">utils/</a> clickoutside.js
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      <div class='fl pad1y space-right2'>
        <span class="strong">22.73% </span>
        <span class="quiet">Statements</span>
        <span class='fraction'>5/22</span>
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        <span class='fraction'>0/22</span>
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        <span class="strong">25% </span>
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        <span class='fraction'>5/20</span>
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">// 导入注册函数
import { on } from './dom'
// 存储所有的添加该指令的元素数组
const nodeList = []
const ctx = '@@@clickoutsideContext' // ctx应该是内容扩展的缩写
let startClick = null
// 在document上注册监听函数
// 这里event,target是不是考虑兼容性？
on(document, 'mousedown', event =&gt; (<span class="cstat-no" title="statement not covered" ><span class="fstat-no" title="function not covered" >startClick = event)</span></span>)
on(document, 'mouseup', event =&gt; <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" >    nodeList.forEach((node) =&gt; <span class="fstat-no" title="function not covered" >{ <span class="cstat-no" title="statement not covered" >node[ctx].handler(event, startClick) </span>})</span></span>
})
&nbsp;
export default {
    // 只执行一次，指令第一次绑定到元素时，执行初始化操作,el挂载元素
    bind: function(el, binding, vnode) <span class="fstat-no" title="function not covered" >{</span>
        let id = <span class="cstat-no" title="statement not covered" >nodeList.push(el) - 1</span>
        // 实际上是一个闭包利用
        const handler = <span class="cstat-no" title="statement not covered" >function(mouseup = {}, mousedown = {}) <span class="fstat-no" title="function not covered" >{</span></span>
<span class="cstat-no" title="statement not covered" >            if (!vnode.context ||</span>
                !mouseup.target ||
                !mousedown.target ||
                el.contains(mouseup.target) ||
                el.contains(mousedown.target) ||
                el === mouseup.target ||
                // 不知道为什么加这个判断？
                (vnode.context.popperElm &amp;&amp;
                    (vnode.context.popperElm.contains(mouseup.target) ||
                        vnode.context.popperElm.contains(mousedown.target)))) {
<span class="cstat-no" title="statement not covered" >                return</span>
            }
            // 不理解？
<span class="cstat-no" title="statement not covered" >            if (binding.expression &amp;&amp; el[ctx].methodName &amp;&amp; vnode.context[el[ctx].methodName]) {</span>
<span class="cstat-no" title="statement not covered" >                vnode.context[el[ctx].methodName]()</span>
            } else {
<span class="cstat-no" title="statement not covered" >                el[ctx].bindingFn &amp;&amp; el[ctx].bindingFn()</span>
            }
        }
<span class="cstat-no" title="statement not covered" >        el[ctx] = {</span>
            id,
            methodName: binding.expression,
            handler,
            bindingFn: binding.value
        }
    },
    update: function(el, binding, vnode) <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" >        el[ctx].methodName = binding.expression</span>
<span class="cstat-no" title="statement not covered" >        el[ctx].bindingFn = binding.value</span>
    },
    // 只执行一次，解绑指令时
    unbind: function(el, binding, vnode) <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" >        for (let i = 0, len = nodeList.length; i &lt; len; i++) {</span>
<span class="cstat-no" title="statement not covered" >            if (nodeList[i][ctx].id === el[ctx].id) {</span>
<span class="cstat-no" title="statement not covered" >                nodeList.splice(i, 1)</span>
<span class="cstat-no" title="statement not covered" >                break</span>
            }
        }
    }
}
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